including scotland yard's top cop. tonight the woman who until recently ran rupert murdoch's newspaper holdings in the uk is under arrest. and the head of the london police department has abruptly resigned amid questions over his department's pursuit of the case. all this being followed very closely in this country, which is home to some of the crown jewels of murdoch's now damaged media empire. nbc's stephanie gosk is in london tonight with late developments for us in the case. stephanie, good evening. >> reporter: good evening, lester. well, the casualties in this story continue to pile up. rebekah brooks, one of rupert murdoch's most trusted executives, is under arrest tonight. her spokesman says that she turned herself in and she's cooperating. then late tonight a surprise announcement from scotland yard that sir paul stephenson, the chief of police for the organization now investigating this scandal, he has stepped down. london's police chief resigned under intense pressure after it emerged that scotland yard hire